None of those covers say "thriller" to me. They're too generic, especially the first one, which actually looks peaceful. If you stuck an embracing couple in the foreground you'd have a nice southern romance cover.
Is there a reason you're so married to this particular font?
Thanks mrsmig. I'm not married to anything really. The fonts in these last three is Bebas neue. In the first ones it was League Gothic.
Any suggestions?